PRESERVING WATER ANIMALS 



swarms of springtails, insect larvae and nymphs, especially 

 those almost ready to leave the water. 



Collect with a water-net. For insects and all smaller 

 animals skim the net through the water, scraping it against 

 the vegetation, but do not scoop into the bottom. 



Fig. 30. — Aquarium tools: I, pipette for picking 

 out frogs' eggs; 2, hand-bulb; 3, wire lifter; 4, aqua- 

 rium net. 



hi the shallows. — In the zone of floating leaves are water- 

 lilies, pondweeds, the stoneworts — Chara and Nitella — 

 water-fern worts, duckweeds, and the liverwort Riccia; algae 

 grow on the submerged stems and "blanket-algae" on quiet 

 water surfaces (PI. X). The larger animals common there 

 are the spotted turtles, bullfrogs and green frogs, perch, 

 catfishes, pickerel, and several kinds of young fishes; the 

 smaller animals include all types of water insects, bryozoans, 

 snails, leeches, and small crustaceans. 



31 



